[mass noun]a white compound which occurs as a mineral in some alkaline salt deposits and is used in making glass and ceramics, as a metallurgical flux, and as an antiseptic 硼砂,月石
A hydrated sodium borate; chem. formula: Na2B4O710H2O 四硼酸钠,化学分子式:Na2B4O710H2O
语源
late Middle English : from medieval Latin, from Arabic būrak, from Pahlavi būrak